package com.fan.reggie.controller;

import com.fan.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.UUID;

@RestController
@RequestMapping("/common")
@Slf4j
/*文件的上传和下载
* */
public class CommonController {

    @Value("${reggie.path}")
    private String bashpath;

    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) throws IOException {
        //file是一个临时文件，需要转存到指定位置，否则本次请求完成后临时文件会删除
        log.info(file.toString());
        //原始文件名,获取.jpg
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //使用uuid重新生成文件名，防止文件名重复造成文件覆盖
        String fileName = UUID.randomUUID().toString()+ suffix;
        //判断文件夹是否存在，不存在则创建
        File dir = new File(bashpath);
        if(!dir.exists()){
            dir.mkdirs();
        }

        file.transferTo(new File(bashpath + fileName));
        return R.success(fileName);
    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) throws IOException {
        //输入流，读取文件内容
        FileInputStream fileInputStream = new FileInputStream(new File(bashpath + name));
        //输出流，将文件写回浏览器
        ServletOutputStream outputStream = response.getOutputStream();

        response.setContentType("image/jpeg");

        int len = 0;
        byte[] bytes = new byte[1024];
        while ((len = fileInputStream.read(bytes))!=-1){
            outputStream.write(bytes,0,len);
            outputStream.flush();
        }
        outputStream.close();
        fileInputStream.close();
    }
}
